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  • 利用BMP通道和UpdateLayeredWindow制作边缘透明不规则窗口

    1.新建 颜色模式RGB颜色 背景内容为透明


    2.填充黑色 因为Alpha通道黑色+前景色黑色时会完全透明


    3.用滤镜做如下效果


    4.选择全部区域并复制 增加Alpha通道


    5.通道中只选Alpha通道 并粘贴选择区域


    6.存盘为BMP格式 这是Alpha通道自动选择


    7.BMP选项为Windows 32位


    8.效果图 边沿透明不规则


    说明:UpdateLayeredWindow函数做透明处理时有两个参数可以调整透明度
    一个是BMP中的Alpha通道的参数,还有一个是BLENDFUNCTION结构中的SourceConstantAlpha参数

    void CUpdateLayeredWindow_testDlg::Test()
    {
    	char bmpFileName[] = {"./back.bmp"};
    	HWND hWnd = this->GetSafeHwnd();
    	typedef BOOL (WINAPI *pfnUpdateLayeredWindow)(HWND hWnd, HDC hdcDst, POINT *pptDst,
    		SIZE *psize, HDC hdcSrc, POINT *pptSrc, COLORREF crKey,
    		BLENDFUNCTION *pblend, DWORD dwFlags);
    	pfnUpdateLayeredWindow s_UpdateLayeredWindow;
    	HMODULE hSysDll = LoadLibrary(_T("USER32.DLL"));
    	if(!hSysDll) return;
    	s_UpdateLayeredWindow = 
    		(pfnUpdateLayeredWindow)GetProcAddress(hSysDll, 
    		"UpdateLayeredWindow");
    	if(!s_UpdateLayeredWindow) return;
    	HBITMAP hbitmap = (HBITMAP)::LoadImage(AfxGetInstanceHandle(),bmpFileName,
    		IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
    	if(!hbitmap) return;
    	DWORD dwExStyle = ::GetWindowLong(hWnd, GWL_EXSTYLE);
    	if ((dwExStyle & 0x80000) != 0x80000)
    		::SetWindowLong(hWnd, GWL_EXSTYLE, dwExStyle ^ 0x80000);
    	HDC hMemDC = CreateCompatibleDC(NULL);
    	HBITMAP hOriBmp = (HBITMAP)SelectObject(hMemDC, hbitmap);
    	BITMAP bi;
    	CBitmap bm;
    	bm.Attach(hbitmap);
    	bm.GetBitmap(&bi);
    	bm.Detach();
    	SetWindowPos(NULL,0,0,bi.bmWidth,bi.bmHeight,0);
    	RECT WndRect;
    	::GetWindowRect(hWnd, &WndRect);
    	POINT ptDst = {WndRect.left, WndRect.top};
    	POINT ptSrc = {0, 0};
    	SIZE WndSize = {WndRect.right-WndRect.left,WndRect.bottom-WndRect.top};
    	#define AC_SRC_ALPHA 0x01
    	#define ULW_ALPHA 0x00000002
    	BLENDFUNCTION blendPixelFunction= { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
    	BOOL bRet= s_UpdateLayeredWindow(m_hWnd, NULL, &ptDst, &WndSize, hMemDC,
    		&ptSrc, 0, &blendPixelFunction, 2);
    	SelectObject(hMemDC, hOriBmp);
    	DeleteObject(hbitmap);
    	DeleteDC(hMemDC);
    }
    


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  • 原文地址:https://www.cnblogs.com/nlsoft/p/2954171.html
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